timescale_info_test.v

来自「pli_handbook_examples_pc verilog hdl 与C」· Verilog 代码 · 共 45 行

/**********************************************************************
 * $timescale_info example -- Verilog test bench source code
 *
 * Verilog test bench to test the $timescale_info PLI application.
 *
 * For the book, "The Verilog PLI Handbook" by Stuart Sutherland
 *  Book copyright 1999, Kluwer Academic Publishers, Norwell, MA, USA
 *   Contact: www.wkap.il
 *  Example copyright 1998, Sutherland HDL Inc, Portland, Oregon, USA
 *   Contact: www.sutherland.com or [phone]
 *********************************************************************/
`timescale 1ns / 1ns
module test;
  reg  a, b, ci, clk;
  wire sum, co;

  addbit i1 (a, b, ci, sum, co);

  initial
    begin
      $timeformat(-6,1," ms",10);
      #1 $timescale_info(i1);
      #1 $finish;
    end
endmodule

/*** A gate level 1 bit adder model ***/
`timescale 1ns / 1ps
module addbit (a, b, ci, sum, co);
  input  a, b, ci;
  output sum, co;

  wire  a, b, ci, sum, co,
        n1, n2, n3;

  xor    (n1, a, b);
  xor #2 (sum, n1, ci);
  and    (n2, a, b);
  and    (n3, n1, ci);
  or  #2 (co, n2, n3);

endmodule
/*********************************************************************/